I am going to change my 3x9 groupset on my 2008 Diamondback Overdrive (29") to a 1x10 drivetrain. Has anyone ever bought the Chinese Shimano version groupsets off of ebay? I am on a very tight budget and this seems budget friendly. I am sure you pay for what you get, but this seems like the most economical way to get a cassette, derailleur, and shifter in a bundle package.